The investigators will longitudinally monitor the hemodynamic parameters along with cumulative fluid administration and fluid balance during conventional fluid strategy, as practiced by the local physicians. For monitoring, we will use transpulmonary thermodilution and arterial pulse contour analysis (PiCCO-plus, Pulsion Medical System, Germany). The PiCCO system is in routine use as part of standard clinical practice to provide hemodynamic monitoring of severely ill patients admitted to ICU. It uses a central venous and arterial line to provide continuous monitoring of hemodynamic function.